Wet treatment of artificial silk cakes



July 31, 1934. K. scHMlD-r WET TREATMENT OF ARTIFICIAL S'ILK CAKES FiledNov. 28, 1951 Patented July 31, 1934 WET TREATMENT OF ARTIFICIAL SILKCAKES Kurt Schmidt, Elberfeld-Grenze, Germany, as-

signor to North American Rayon Corporation, New York, N. Y., acorporation of Delaware Application November 28, 1931, Serial No.577,834 In Germany November 28, 1930 4 Claims.

The invention relates to the wet treatment rof artificial silk cakes,which have been manufactured by the pot spinning process.

More particularly the invention comprises a process for the treatment ofcakes, by which the treatment liquids are conducted along the walls ofthe cakes.

Further details are to be seen from the following description:

l0 According to numerous, previously known methods of washing cakes, thewashing and after-treatment liquids are conducted through the cakes.According to the present invention, however, the liquids aresubstantially not conducted through the cakes, but are made to flowalong the inside and the outside of the artificial silk cakes. The wettreatment is in this case practically dominated exclusively by thepowers of lixiviation or diffusion. For carrying out the process thecakes, for example the Viscose silk cakes, are placed into a liquidcontainer and preferably placed pipe-like one above the other. By meansof suitable inlet pipes in the bottom of the container the treatmentliquid is allowed to enter, to now along the inside and outside surfacesof the cakes and then, for example, to flow away by running over. Y

The present invention is set forth in the accompanying drawing, in whichFigure 1 is a cross-sectional View of a portion of the treating vesselwith a cake shown therein, and

Figure 2 is a perspective view, partially in cross-section, disclosingthe manner of operation of the invention,

Referring to the drawing the invention is more particularly explained inthe following:

In Fig. 1 the treatment vessel is marked l, an inlet pipe 2 for thetreatment liquid, through which the liquid is conducted from below andenters into the treatment vessel at the topover the edge of the pipe andinto the inside of the cake 4, which is surrounded by a fabric 6 andsupported by an elastic shell of wire net-work 3. The liquid then flowsdownwards along the inner wall of the cake, enters at the bottom frontside of the cake, where the cake is supported in an appropriate manner',into the outside of the vessel 1 to rise there along the outside of thecake and then to flow off over the edge of the vessel through theoverflow pipe 5.

According to Fig. 2 two cakes, which are also enclosed in porous fabric6, are placed one above the other in the circular vessel 1 and securedin their places by the load ring 7.. Between the load ring '7 Vand thefront side of the upper cake a ring 8 made of material porous to liquidsis inserted, which facilitates the penetration of the treatment liquidto the front side of the cake. As in Fig. 1 the inlet of the treatmentliquid takes place through the pipe 2 from the bottom. The liquid flowsover the edge 9 of the pipe 2,V flows through the circular space l0between pipe 2 and the inside wall of the cake, flows under the cakesupporting plate 1l into the outside circular space 12 between theoutside surface of the cake and the wall of the container 1, flows inthis upwards and over the edge 13, which lies somewhat lower than theedge 9 of pipe 2, into the pipe 5 and from this is discharged by theoutflow pipe 14.

Many cakes can be exposed, distributed next to eachother, in the sametreatment vessel on suitable perforated grids and several cops can beplaced column-like one above the other. In the same way a series ofsuchgrids can be arranged one above the other in the Vsame box. In thiscase the treatment liquid is allowed to flow in one stream through thewhole box either from the bottom to the top or from the ktop to thebottom. In order that the cakes, especially at the first contact withthe treatment liquid, remain firmly in position, they can be held in thedesired position by suitable devices, such as load rings, elastic innerstiffenings porous to water, or the like. The several cakes can alsobefore treatment be wound round with holding threads in the well-knownmanner or enveloped in porous cloths tol prevent the single threads andthread layers from being swept away in the wet treatment.

Having thus described my invention, what I. claim is: Y

1. In a process for the wet treatment of articial silk cakes the stepsof conducting the treating liquids downwards onthe inside of the cake,

, underneath the cake and upwards on the outside of the cake and thenleading off the liquids.

2. In a process for wet treating cakes of artificial filaments, threads,etc., the steps of supporting the cake, passing a treating liquiddownwardly over the inner face of the cake, and then passing the liquidupwardly over the outer face of the cake.

3. The process as set forth in claim 2, wherein the cake is wrappedprior to the wet treatment thereof.

4. The process as set forth in claim 2, wherein a plurality of cakes aretreated simultaneously, the cakes being arranged in superimposedposition with respect to each other, and pressure being applied to theupper edge of the topmost cake.

KURT SCHMIDT.

